function withData(param) {
    return param < 10 ? '0' + param : '' + param;
  }
  function getLoopArray(start, end) {
    var start = start || 0;
    var end = end || 1;
    var array = [];
    for (var i = start; i <= end; i++) {
      array.push(withData(i));
    }
    return array;
  }
  function getMonthDay(year, month) {
    var flag = year % 400 == 0 || (year % 4 == 0 && year % 100 != 0), array = null;
  
    switch (month) {
      case '01':
      case '03':
      case '05':
      case '07':
      case '08':
      case '10':
      case '12':
        array = getLoopArray(1, 31)
        break;
      case '04':
      case '06':
      case '09':
      case '11':
        array = getLoopArray(1, 30)
        break;
      case '02':
        array = flag ? getLoopArray(1, 29) : getLoopArray(1, 28)
        break;
      default:
        array = '月份格式不正确，请重新输入！'
    }
    return array;
  }
  function getNewDateArry() {
    // 当前时间的处理
    var newDate = new Date();
    var year = withData(newDate.getFullYear()),
      mont = withData(newDate.getMonth() + 1),
      date = withData(newDate.getDate()),
      hour = withData(newDate.getHours()),
      minu = withData(newDate.getMinutes()),
      seco = withData(newDate.getSeconds());
  
    return [year, mont, date, hour, minu, seco];
  }
  function dateTimePicker(startYear, endYear, date) {
    // 返回默认显示的数组和联动数组的声明
    var dateTime = [], dateTimeArray = [[], [], [], [], [], []];
    var start = startYear || 1978;
    var end = endYear || 2100;
    // 默认开始显示数据
    var defaultDate = date ? [...date.split(' ')[0].split('-'), ...date.split(' ')[1].split(':')] : getNewDateArry();
    // 处理联动列表数据
    /*年月日 时分秒*/
    dateTimeArray[0] = getLoopArray(start, end);
    dateTimeArray[1] = getLoopArray(1, 12);
    dateTimeArray[2] = getMonthDay(defaultDate[0], defaultDate[1]);
    dateTimeArray[3] = getLoopArray(0, 23);
    dateTimeArray[4] = getLoopArray(0, 59);
    dateTimeArray[5] = getLoopArray(0, 59);
  
    dateTimeArray.forEach((current, index) => {
      dateTime.push(current.indexOf(defaultDate[index]));
    });
  
    return {
      dateTimeArray: dateTimeArray,
      dateTime: dateTime
    }
  }
  module.exports = {
    dateTimePicker: dateTimePicker,
    getMonthDay: getMonthDay
  }